<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  
      <div id="app">
        <ul>
          <li v-for="item in arr" :key="item">{{item}}</li>
        </ul>
      </div>
      <script src="../js/vue.js"></script>
      <script>
          var app=new Vue({
             el:'#app',
             data:{
              arr: ["aa", "bb", "cc","dd"]
             },
             methods:{}
          });
      </script>
</body>
</html>